Forum Discussion
Exchange Online Mailbox cannot see Unsynchronized On-Premises mailbox Free/Busy info and vice versa
Hello Everyone! I originally posted an issue on Microsoft Learn https://learn.microsoft.com/en-us/answers/questions/5651848/free-busy-not-viewable-from-on-premises-mailbox-to?comment=answer-124182...
Hi,
Find below free/busy working in hybrid and reference articals.
Hybrid Free/Busy
- First, we check if we have an Intra-Organization Connector (1) with the domain name of contoso.mail.onmicrosoft.com (assuming the Exchange server is version 2013 or later).
- If an IOC does not exist, then we look to see if an Organization Relationship (2) is configured by looking for the domain name of contoso.mail.onmicrosoft.com in the list of any existing Organization Relationships.
- If neither an IOC nor an Organization Relationship for the domain contoso.mail.onmicrosoft.com exists, then we look for the domain name contoso.mail.onmicrosoft.com as an Availability Address Space (3).
Demystifying Hybrid Free/Busy: what are the moving parts? | Microsoft Community Hub
Deep Dive: How Hybrid Authentication Really Works | Microsoft Community Hub